"direct coupling" meaning in English

{
  "forms": [
    {
      "form": "direct couplings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
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      "expansion": "direct coupling (countable and uncountable, plural direct couplings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Energy transfer achieved by means of physical contact, i.e., coupling other than inductive or capacitive coupling."
      ],
      "id": "en-direct_coupling-en-noun-IcEP01~x",
      "links": [
        [
          "transfer",
          "transfer"
        ],
        [
          "coupling",
          "coupling"
        ]
      ],
      "related": [
        {
          "word": "capacitive coupling"
        },
        {
          "word": "inductive coupling"
        }
      ],
      "synonyms": [
        {
          "word": "conductive coupling"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "direct coupling"
}

{
  "forms": [
    {
      "form": "direct couplings",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "direct coupling (countable and uncountable, plural direct couplings)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "capacitive coupling"
    },
    {
      "word": "inductive coupling"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns"
      ],
      "glosses": [
        "Energy transfer achieved by means of physical contact, i.e., coupling other than inductive or capacitive coupling."
      ],
      "links": [
        [
          "transfer",
          "transfer"
        ],
        [
          "coupling",
          "coupling"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "conductive coupling"
    }
  ],
  "word": "direct coupling"
}